如何创建自定义消息框？

Question

我的 MessageBox 没有实时给出值。我正在尝试创建一个自定义消息框，根据按下的按钮给出值。

我的代码可以正常工作，但它没有实时给我值。有什么办法可以实时获取值吗？我哪里做得不好，帮帮我...我看到很多人不回答我，也不告诉我原因。

基本上我想像 python tkinter 的真实消息框一样重视。就像我们创建它的对象并且它具有根据按下哪个按钮的值 - 类似的东西。希望大家理解。

from tkinter import *

class MessageBox(object):

    def __init__(self,title='Mess', msg='', b1='OK', b2='',b3='',b4=''):

    # Required Data of Init Function
        self.title = title      # Is title of titlebar
        self.msg = msg          # Is message to display
        self.b1 = b1            # Button 1 (outputs '1')
        self.b2 = b2            # Button 2 (outputs '2')
        self.b3 = b3            # Button 3 (outputs '3')
        self.b4 = b4            # Button 4 (outputs '4')
        self.choice = ''        # it will be the return of messagebox according to button press

    # Just the colors for my messagebox

        self.tabcolor = 'red' # Button color for Active State
        self.bgcolor = 'blue'    # Button color for Non-Active State
        self.bgcolor2 = 'yellow' # Background color of Dialogue
        self.textcolor = 'Green' # Text color for Dialogue

    # Creating Dialogue for messagebox
        self.root = Toplevel()
    
    # Removing titlebar from the Dialogue
        self.root.overrideredirect(True)

    # Setting Geometry
        self.root.geometry("300x120+100+100")
    
    # Setting Background color of Dialogue
        self.root.config(bg=self.bgcolor2)

    # Creating Label For message
        self.msg = Label(self.root,text=msg,
                        font=("Helvetica",9),
                        bg=self.bgcolor2,
                        fg=self.textcolor,
                        #anchor='nw'
                        )
        self.msg.place(x=10,y=28,height=60,width=280)

    # Creating TitleBar
        self.titlebar = Label(self.root,text=self.title,
                             bg=self.bgcolor2,
                             fg=self.textcolor,
                             bd=0,
                             font=("Helvetica",10,'bold')
                             )
        self.titlebar.place(x=100,y=5)
    
        # Creating Close Button
        self.CloseBtn = Button(self.root,
                                text='x',
                                font=("Helvetica",12),
                                command = lambda : self.closed(),
                                bd=0,
                                activebackground='red',
                                activeforeground='white',
                                background=self.bgcolor2,
                                foreground=self.textcolor)
        self.CloseBtn.place(x=260,y=0,width=40)
 
        # Changing Close Button Color on Mouseover
        self.CloseBtn.bind("<Enter>", lambda e,: self.CloseBtn.config(bg='red',fg='white'))
        self.CloseBtn.bind("<Leave>", lambda e,: self.CloseBtn.config(bg=self.bgcolor2,fg=self.textcolor))

    # Creating B1 
        self.B1 = Button(self.root,text=self.b1,command=self.click1,
                        bd=0,
                        font=("Helvetica",10),
                        bg=self.bgcolor,
                        fg='white',
                        activebackground=self.tabcolor,
                        activeforeground=self.textcolor)
        self.B1.place(x=225,y=90,height=25,width=60)
    
    # Getting place_info of B1
        self.B1.info = self.B1.place_info()
    
    # Creating B2
        if not b2=="":
            self.B2 = Button(self.root,text=self.b2,command=self.click2,
                            bd=0,
                            font=("Helvetica",10),
                            bg=self.bgcolor,
                            fg='white',
                            activebackground=self.tabcolor,
                            activeforeground=self.textcolor)
            self.B2.place(x=int(self.B1.info['x'])-(70*1),
                          y=int(self.B1.info['y']),
                          height=int(self.B1.info['height']),
                          width=int(self.B1.info['width'])
                          )
    # Creating B3
        if not b3=='':
            self.B3 = Button(self.root,text=self.b3,command=self.click3,
                            bd=0,
                            font=("Helvetica",10),
                            bg=self.bgcolor,
                            fg='white',
                            activebackground=self.tabcolor,
                            activeforeground=self.textcolor)
            self.B3.place(x=int(self.B1.info['x'])-(70*2),
                          y=int(self.B1.info['y']),
                          height=int(self.B1.info['height']),
                          width=int(self.B1.info['width'])
                          )
    # Creating B4
        if not b4=='':
            self.B4 = Button(self.root,text=self.b4,command=self.click4,
                            bd=0,
                            font=("Helvetica",10),
                            bg=self.bgcolor,
                            fg='white',
                            activebackground=self.tabcolor,
                            activeforeground=self.textcolor)
            self.B4.place(x=int(self.B1.info['x'])-(70*3),
                          y=int(self.B1.info['y']),
                          height=int(self.B1.info['height']),
                          width=int(self.B1.info['width'])
                          )

    # Making MessageBox Visible
        self.root.mainloop()

    # Function on Closeing MessageBox
    def closed(self):
        self.root.destroy() # Destroying Dialogue
        self.choice='closed'#Assigning Value
        
    # Function on pressing B1
    def click1(self):
        self.root.destroy() # Destroying Dialogue
        self.choice='1'     # Assigning Value

    # Function on pressing B2
    def click2(self):
        self.root.destroy() # Destroying Dialogue
        self.choice='2'     # Assigning Value

    # Function on pressing B3
    def click3(self):
        self.root.destroy() #Destroying Dialogue
        self.choice='3'     # Assigning Value

    # Function on pressing B4
    def click4(self):
        self.root.destroy() #Destroying Dialogue
        self.choice='4'     #Assigning Value

root = Tk()

def func():
    a = MessageBox(msg='Hello I m your multiline message',
                    title='Hello World',
                    b1='Button 1',
                    b2='Button 2',
                    )
    print(a.choice)

Button(root,text='Click Me',command=lambda : func()).pack()

root.mainloop()

Answer 1

您不应该在 class 中调用 mainloop。作为一般的经验法则，您应该只在程序的生命周期内调用一次 mainloop() 。您已经在创建根 window 后在主逻辑中调用它，所以您不应该再次调用它。

相反，您可以使用 wait_window 等到 window 被销毁后再返回：

# Making MessageBox Visible
self.root.wait_window()

如何创建自定义消息框？

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